Improve persian string ordering

It performs better when we have also non-Persian strings. It puts Persian strings before non-Persian strings.

sorting/persian.js

@@ -1,11 +1,12 @@
 /**
- * Sorting in Javascript can be difficult to get right with non-Roman 
- * characters - for which special consideration must be made. This plug-in 
+ * Sorting in Javascript can be difficult to get right with non-Roman
+ * characters - for which special consideration must be made. This plug-in
  * performs correct sorting on Persian characters.
  *
  *  @name Persian
  *  @summary Sort Persian strings alphabetically
  *  @author [Afshin Mehrabani](http://www.afshinblog.com/)
+ *  @author [Mohammad Javad Naderi](https://github.com/mjnaderi)
  *
  *  @example
  *    $('#example').dataTable( {
@@ -15,45 +16,47 @@
  *    } );
  */
 
-(function(){
-
-var persianSort = [ 'آ', 'ا', 'ب', 'پ', 'ت', 'ث', 'ج', 'چ', 'ح', 'خ', 'د', 'ذ', 'ر', 'ز', 'ژ',
-					'س', 'ش', 'ص', 'ط', 'ظ', 'ع', 'غ', 'ف', 'ق', 'ک', 'گ', 'ل', 'م', 'ن', 'و', 'ه', 'ی', 'ي' ];
-
-function GetUniCode(source) {
-	source = $.trim(source);
-	var result = '';
-	var i, index;
-	for (i = 0; i < source.length; i++) {
-		//Check and fix IE indexOf bug
-		if (!Array.indexOf) {
-			index = jQuery.inArray(source.charAt(i), persianSort);
-		}else{
-			index = persianSort.indexOf(source.charAt(i));
-		}
-		if (index < 0) {
-			index = source.charCodeAt(i);
-		}
-		if (index < 10) {
-			index = '0' + index;
-		}
-		result += '00' + index;
-	}
-	return 'a' + result;
-}
-
-jQuery.extend( jQuery.fn.dataTableExt.oSort, {
-	"pstring-pre": function ( a ) {
-		return GetUniCode(a.toLowerCase());
-	},
-
-	"pstring-asc": function ( a, b ) {
-		return ((a < b) ? -1 : ((a > b) ? 1 : 0));
-	},
-
-	"pstring-desc": function ( a, b ) {
-		return ((a < b) ? 1 : ((a > b) ? -1 : 0));
-	}
-} );
-
-}());
+(function () {
+
+    var persianSort = ['آ', 'ا', 'ب', 'پ', 'ت', 'ث', 'ج', 'چ', 'ح', 'خ', 'د', 'ذ', 'ر', 'ز', 'ژ',
+        'س', 'ش', 'ص', 'ط', 'ظ', 'ع', 'غ', 'ف', 'ق', 'ک', 'گ', 'ل', 'م', 'ن', 'و', 'ه', 'ی', 'ي'];
+
+    function GetUniCode(source) {
+        source = $.trim(source);
+        var result = '';
+        var i, index;
+        for (i = 0; i < source.length; i++) {
+            //Check and fix IE indexOf bug
+            if (!Array.indexOf)
+                index = jQuery.inArray(source.charAt(i), persianSort);
+            else
+                index = persianSort.indexOf(source.charAt(i));
+
+            if (index < 0)
+                index = source.charCodeAt(i) + 40;
+
+            if (index < 10)
+                index = '00' + index;
+            else if (index < 100)
+                index = '0' + index;
+
+            result += index;
+        }
+        return 'a' + result;
+    }
+
+    jQuery.extend(jQuery.fn.dataTableExt.oSort, {
+        "pstring-pre": function (a) {
+            return GetUniCode($(a.toLowerCase()).text());
+        },
+
+        "pstring-asc": function (a, b) {
+            return ((a < b) ? -1 : ((a > b) ? 1 : 0));
+        },
+
+        "pstring-desc": function (a, b) {
+            return ((a < b) ? 1 : ((a > b) ? -1 : 0));
+        }
+    });
+
+}());